<template>
  <div class="cart">
    <!-- 看ele-ui是否引入成功 -->
    <!-- <el-button type="primary">主要按钮</el-button>
  <el-button type="success">成功按钮</el-button>
  <el-button type="info">信息按钮</el-button>
  <el-button type="warning">警告按钮</el-button>
  <el-button type="danger">危险按钮</el-button> -->
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body" v-for="(shopCart, index) in shopCartList" :key="index">
        <ul class="cart-list" v-for="cartInfo in shopCart.cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cartInfo.isChecked" @click="changeOneIsCheck(cartInfo)">
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl">
            <div class="item-msg">{{ cartInfo.skuName }}</div>
          </li>
          <!-- <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li> -->
          <li class="cart-list-con4">
            <span class="price">{{ cartInfo.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="updateShopCartNum(cartInfo,-1)">-</a>
            <input autocomplete="off" type="text" :value="cartInfo.skuNum" minnum="1" @change="updateShopCartNum(cartInfo,Math.ceil($event.target.value) - cartInfo.skuNum)" class="itxt">
            <a href="javascript:void(0)" class="plus" @click="updateShopCartNum(cartInfo,1)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cartInfo.skuPrice * cartInfo.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="javascript:;" class="sindelet" @click="deleteOneCart(cartInfo)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="isAllCheck">
        <span>全选</span>
      </div>
      <div class="option">
        <a href="javascript:;" @click="deleteMoreCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ checkedNum }}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ allMoney }}</i>
        </div>
        <div class="sumbtn">
          <!-- <a class="sum-btn" href="###" target="_blank">结算</a> -->
          <router-link to="/trade" class="sum-btn">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapState } from 'vuex'
export default {
  name: 'ShopCart',
  methods: {
    getShopCartList() {
      this.$store.dispatch('cart/getShopCartList');
    },
    //改变单选状态
    async changeOneIsCheck(cartInfo) {
      //向后端数据库发送数据修改，成功重新请求数据渲染，失败弹窗
      try {
        let skuId = cartInfo.skuId;
        //注意：isChecked是布尔值，但是要求返回1或0
        let isChecked = cartInfo.isChecked ? 0 : 1;
        await this.$store.dispatch('cart/updateOneIsCheck', { skuId, isChecked });
        alert('修改选中状态成功');
        this.getShopCartList();
      } catch (error) {
        alert(error.message);
      }


    },

    //更新购物车数量
    async updateShopCartNum(cartInfo,changeNum){
      // console.log(111)
      try {
        //修正
        // console.log((changeNum + cartInfo.skuNum) < 1)
        //NaN === NaN，false   Num
        if (Number.isNaN(changeNum)) {
          changeNum = 1 - cartInfo.skuNum;
        }
        if ((changeNum + cartInfo.skuNum) < 1) {
          //changeNum + cartInfo.skuNum = 1
          changeNum = 1 - cartInfo.skuNum;
        }
        //代码少，但不好理解
        // if (!((changeNum + cartInfo.skuNum) > 0)) {
        //   changeNum = 1 - cartInfo.skuNum;
        // }
        await this.$store.dispatch('cart/addOrUpdateShopCart',{skuId:cartInfo.skuId,skuNum:changeNum})
        alert('修改数量成功');
        //重新获取数据渲染
        this.getShopCartList();
      } catch (error) {
        // console.log(error.message)
        alert('修改数量失败，原因是：' + error.message);
      }
    },

    //删除单个购物车
    async deleteOneCart(cartInfo){
      try {
        await this.$store.dispatch('cart/deleteOneCart',cartInfo.skuId);
        alert('删除成功');
        this.getShopCartList();
      } catch (error) {
        alert('删除失败，原因是：' + error.massage);
      } 
    },
    //删除多个购物车
    async deleteMoreCart(){
      try {
        let skuList = [];
        this.shopCartList.forEach(item => {
          item.cartInfoList.forEach(item1 => {
            if(item1.isChecked) {
              skuList.push(item1.skuId);
            }
          })
        })
        // console.log(skuList)
        await this.$store.dispatch('cart/deleteMoreCart',skuList);
        alert('修改多个购物车成功');
        this.getShopCartList();
      } catch (error) {
        alert('修改多个购物车失败：原因是：' + error.message);
      }
    }

  },
  computed: {
    ...mapState('cart', ['shopCartList']),
    //已选数量
    checkedNum() {
      //双层reduce
      return this.shopCartList.reduce((prev, item) => {

        prev += item.cartInfoList.reduce((prev1, item1) => {
          //判断是否已勾选
          if (item1.isChecked) {
            prev1 += item1.skuNum
          }
          return prev1;
        }, 0)

        return prev;

      }, 0);


    },
    //总价
    allMoney() {
      return this.shopCartList.reduce((prev, item) => {

        prev += item.cartInfoList.reduce((prev1, item1) => {
          if (item1.isChecked) {
            prev1 += item1.skuNum * item1.skuPrice;
          }
          return prev1;
        }, 0)

        return prev;

      }, 0);
    },
    //是否全选
    isAllCheck: {
      get() {
        // return this.shopCartList.every(item => {
        //   return item.cartInfoList.every(item1 => {
        //     return item1.isChecked;
        //   })
        // })\
        //空数组的every返回true。&& this.shopCartList.length转为布尔值，保证空数组返回false
        return this.shopCartList.every(item => item.cartInfoList.every(item1 => item1.isChecked)) && this.shopCartList.length;
      },
      async set(value) {
        try {
          //发送请求修改数据库
          let isChecked = value ? 1 : 0;
          let skuIdList = [];
          this.shopCartList.forEach(item => {
            item.cartInfoList.forEach(item1 => {
              if (item1.isChecked !== value)
                skuIdList.push(item1.skuId);
            })
          })
          await this.$store.dispatch('cart/updateAllIsCheck', { isChecked, skuIdList });
          //修改成功，重新请求渲染
          alert('全选修改成功');
          this.getShopCartList();
        } catch (error) {
          alert(error.message);
        }



      }
    }

  },
  mounted() {
    this.getShopCartList();
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      &>div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        &>li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }



        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>